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JP2001292492

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DESCRIPTION JP2001292492
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
crossover point setting device for a plurality of loudspeakers, and more particularly, at least two
loudspeakers among a loudspeaker for high frequency, a loudspeaker for mid frequency and a
loudspeaker for low frequency. The present invention relates to a frequency characteristic setting
device for setting frequency characteristics so as to prevent interference between the speakers in
the provided acoustic system.
[0002]
2. Description of the Related Art In an audio system, high frequency speakers, mid frequency
speakers and low frequency speakers may be installed. In such an acoustic system, in order to
prevent mutual interference by each speaker and obtain a high-quality voice output, signal
components other than the frequency band covered by each speaker are cut in advance using a
filter. ing. And, the setting of the frequency characteristics of the filter for cutting out the signal
components out of the band is based on the skilled engineer measuring the actual sound output
from the sound system when the speaker is actually installed, The filter frequency characteristics
are set so that the pass bands of the respective speakers do not overlap. However, when the filter
frequency characteristics are set empirically by a technician, the quality of the sound reproduced
in the acoustic system depends on the ability of the technician due to the skill level etc. Even
when trying to adjust the frequency characteristics of the filter, the desired voice quality is often
not obtained. Moreover, even if desired voice quality is obtained, it takes a lot of time to set the
frequency characteristics of the filter.
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[0003]
There is also proposed a method of appropriately setting frequency characteristics of signals
supplied to each speaker on a monitor screen of a computer in an audio system provided with
speakers for each of low, middle and high regions. In this method, a desired frequency
characteristic is digitally obtained by a digital signal processor (DSP), and the frequency
characteristic is shown in (A) to (C) of FIG. A graph showing the frequency characteristics for
each of the middle and high frequency bands is displayed on the monitor screen, and the gain
adjustment operator Cg arranged on the graph is moved up and down, and the cutoff frequency (
The setting is made by moving the operating element Ccut for setting the frequency of -3 dB to
the left and right. Such setting of the frequency characteristic by the DSP can be made by visually
changing and adjusting the characteristic curve by the movement of the manipulator, so that the
frequency characteristic of each band can be easily set.
[0004]
However, in the method of setting the frequency characteristic of the signal to the speaker by the
DSP according to the conventional example, as shown in FIG. 5, only the frequency characteristic
of one band can be displayed on the monitor screen. It can not be set while comparing frequency
characteristics. Therefore, for example, the graph of the frequency characteristic for the low
frequency band as shown in FIG. 5A is read out on the monitor screen, the gain and the cutoff
frequency are set by the movement of the operator, and then It is necessary to read out the
middle and high frequency graphs as shown in B) and (C) sequentially on the monitor screen and
to set the gain and the cutoff frequency in the same manner. In addition, since changing the
frequency characteristic of a certain band causes the frequency characteristic of the other band
to be affected, it may be necessary to set the frequency characteristic of the other band again.
[0005]
As described above, also in the frequency characteristic setting method by the DSP of the
conventional example, the graph of the frequency characteristic is displayed on the monitor
screen so that the frequency characteristics of all the low, middle and high regions become
desired. If one is read out, it is necessary to move the operator to adjust the frequency
characteristics, and to repeat the work by trial and error. Therefore, the setting operation is
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complicated, and it takes a relatively long time to complete the setting.
[0006]
The present invention has been made in view of such problems in the prior art, and its object is
to provide an audio system in which speakers are individually installed for a plurality of bands, in
which frequency of signals supplied to the speakers is provided. An object of the present
invention is to provide a frequency characteristic setting device for setting characteristics easily
and in a short time.
[0007]
According to a first aspect of the present invention, there is provided a frequency characteristic
setting device in an acoustic system comprising a plurality of speakers provided corresponding
to a plurality of bands according to the present invention. In the frequency characteristic setting
device in which the frequency characteristic in the acoustic system can be adjusted by moving
the operating element on the monitor screen, (a) changing the characteristic of each frequency
characteristic for each set band Means for simultaneously displaying on the monitor screen
together with the operation elements for performing the operation, and means for displaying
these frequency characteristics on the first portion of the monitor screen, and (b) adding the
frequency characteristics for each band set. Means for displaying on the second part of the
monitor screen a summed frequency characteristic representing the frequency characteristics of
the entire band, obtained by the step (c) on the first part of the monitor screen A means for
calculating a change in frequency characteristics of each band associated with the movement
when a manipulator is moved, and (d) each of the digital signal processors in response to the
change in the calculated frequency characteristics (E) changing the corresponding frequency
characteristic displayed on the first portion of the monitor screen in response to the change of
the frequency characteristic calculated in (b) And means for changing the displayed addition
frequency characteristic.
[0008]
In the frequency characteristic device described above, preferably, (f) the frequency
characteristic for each band obtained by measuring in advance each acoustic signal generated
from each speaker, the second portion on the monitor screen The display device further
comprises means for displaying simultaneously, whereby movement of the operating element
displayed in the first part can be performed with reference to the displayed frequency
characteristic of each band.
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Also, (g) an acoustic signal input source for inputting an acoustic signal to an acoustic system, (h)
a microphone for sensing an acoustic output outputted from the acoustic system, and (i)
frequency characteristics of the acoustic output sensed by the microphone It is preferable that
the apparatus comprises means for measuring (j) and means for displaying the measured
frequency characteristic on a monitor screen.
This makes it possible to confirm the frequency characteristics of the acoustic output that is
actually output by setting the frequency characteristics. Further, the plurality of frequency bands
described above are the high band, the middle band, and the low band, and the operators on the
monitor screen are for gain adjustment and are arranged on the graph of the frequency
characteristics of each of these three frequency bands. It is preferable to include an operator for
cut-off frequency adjustment, and an operator for cross point adjustment that represents a cross
point between the low band and the mid band and a cross point between the middle band and
the high band.
[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a block diagram of an
acoustic system provided with a frequency characteristic setting device according to the present
invention. In the figure, reference numerals 11, 12 and 13 denote a microphone, a playing device
and a noise generator which constitute an acoustic input source, and acoustic signals from these
acoustic input sources are processed by a digital signal processor (DSP) 30 via a preamplifier 2.
Supplied to The DSP 30 digitally processes the signal, and the input acoustic signal is divided and
adjusted by the DSP 30 into three frequency bands of high, middle and low frequencies, and the
power amplifiers 40 H, 40 M, It is supplied to the high frequency speaker (high frequency SP) 50
H, the mid frequency speaker (mid frequency SP) 50 M, and the low frequency speaker (low
frequency SP) 50 L via 40 L and reproduced from these speakers. Note that the high band, the
mid band, and the low band are respectively represented by subscripts H, M, and L. Reference
numeral 60 denotes a personal computer (PC) for controlling the DSP 30. Although not shown,
the personal computer 60 includes monitor means, memory means, and input means such as a
keyboard and a mouse.
[0010]
The DSP 30 has the configuration shown in FIG. 2 and has three channels of high band, middle
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band and low band. The high-pass channel has a high-pass filter (HPF) 31H, a gain adjuster
(GAIN) 32H, a phase adjuster (φ) 33H, an equalizer (EQ) 34H, and a delay means (DELAY) 35H.
And similar circuits in the low band channel. However, it is needless to say that in the middle
band and the low band channel, a band pass filter (BPF) 31M and a low pass filter (LPF) 31L are
used instead of the high band channel HPF 31H.
[0011]
FIG. 3 shows a frequency characteristic setting device for adjusting the frequency characteristic
according to the present invention for controlling the DSP 30 by the PC 60 in the acoustic
system shown in FIGS. 1 and 2. In FIG. 3, the same components as those shown in FIGS. 1 and 2
are denoted by the same reference numerals. As apparent from FIG. 3, the frequency
characteristic setting device according to the present invention is the microphone 70 and the
microphone 70 arranged to detect the sound output from the speakers 50H, 50M and 50L in the
sound system of FIG. 1. And a measuring instrument 90 incorporating a measuring acoustic
source for supplying a sound source signal for measurement to the DSP 30.
[0012]
Note that, instead of the measurement acoustic source incorporated in the measuring device 80,
the acoustic input sources (11 to 13) shown in FIG. 1 can also be used. If the PC 60 is equipped
with a sound system such as a sound board, the measuring instrument 90 can also be
incorporated in the PC 60. In the memory means of the PC 60, there are stored graphs
respectively representing the frequency characteristics currently set in the three channels of the
high band, the mid band and the low band in the DSP 30. Further, a graph of frequency
characteristics obtained by actually generating an acoustic output from the speakers of these
three channels and measuring the acoustic output for each channel is also stored in the memory
means.
[0013]
The operation of the frequency characteristic setting device shown in FIG. 3 will be described
below with reference to FIG. 4 schematically showing the display screen of the monitor means of
the PC 60. When the setting process of the frequency characteristic starts, the PC 60 reads the
graph of the frequency characteristic currently set in the three channels of the high band, the
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middle band and the low band from the memory means, as shown in FIG. The graph is displayed
on the lower left block B1 of the screen of the monitor means, and the graph of the previously
measured frequency characteristics of the speakers of these channels is read out and displayed
on the upper left block B2 (thin line in FIG. 4). Further, the PC 60 adds the frequency
characteristics of the three channels currently set, and displays a graph representing the added
frequency characteristics representing the currently set frequency characteristics of the entire
acoustic system on the block B2 of the monitor screen. This display is superimposed on the
graph of the frequency characteristic measured in advance, and displayed in a graph
distinguishable from the graph (thick line in FIG. 4).
[0014]
A block B3 at the lower right of FIG. 4 has operation elements Cd (H), Cd (M), and Cd (M) for
setting delay times in the delay means 35H, 35M and 35L (FIG. 2) of each of the three channels
It is a delay time setting unit that displays Cd (L), and the block B4 on the upper right of FIG. 4 is
a display / non-display switching of the frequency characteristics of each channel and a display
of the added (ie, overall) frequency characteristics It is a switching setting unit for enabling
selective control of switching / non-display on the monitor screen.
[0015]
Next, the operator looks at the monitor screen, refers to the pre-measured frequency
characteristic on the block B2, moves the appropriate operating element on the block B1 up and
down, and to the left or right to approximate the characteristic, Make adjustments for
In block B1 of FIG. 4, Cg and Ccut are a gain adjustment operator and a cutoff frequency
adjustment operator, respectively, as described in connection with the conventional example. It is
a crosspoint frequency adjustment operator for adjusting the crosspoint frequency at which the
graphs of the frequency characteristics of the bands intersect.
[0016]
When the operator moves the appropriate operator in block B1 on the monitor screen,
accordingly, under the control of the PC 60, the appropriate filters (31H, 31M, 31L) in FIG. 32H,
32M, 32L) settings are changed, which changes the frequency characteristics of the high band,
middle band and low band channels. The changed frequency characteristic setting conditions are
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updated and stored in the memory means. At this time, every time the frequency characteristic is
changed, the PC 60 adds up the frequency characteristic set for each channel to obtain the
frequency characteristic of the entire acoustic system, and blocks the frequency characteristic on
the monitor screen. Since the message is displayed on B2 (thick line in FIG. 4), the operator
moves the operation element displayed on the block B1 below the block B2 while monitoring the
change of the calculation result displayed on the block B2 of the monitor screen. It can be done.
Therefore, the frequency characteristics of the entire band can be optimally adjusted while the
operator monitors the calculation result.
[0017]
It should be noted that, instead of the operator monitoring the measurement result on the
monitor screen, the PC 60 monitors the calculation result, and when the frequency characteristic
within the allowable error range is obtained in the entire band, the operator is notified on the
monitor screen. It may be configured to indicate that the setting should be completed. Also, the
frequency characteristics of the acoustic output from the acoustic system can be obtained not
only by using the microphone 70 and the measuring device 90 for confirmation after setting the
frequency characteristics but also by using the microphone and the measuring device during
adjustment of the frequency characteristics. May be measured and displayed on block B2 of the
monitor screen. This allows the operator to adjust the frequency characteristics of each channel
while looking at the frequency characteristics of the actual sound output. Furthermore, instead of
measuring the frequency characteristics of the three channels in advance, data of a frequency
characteristic diagram published by a speaker manufacturer or the like may be input. This makes
it possible to set data in advance without the need to measure individual speaker characteristics
and without actual speakers.
[0018]
As described above, in an audio system having a plurality of speakers provided corresponding to
a plurality of bands, in a device for moving the operators on the monitor screen to set the
frequency of each band, adjusting a certain operator Then, the frequency represented by the
other operators is affected thereby. In the conventional example, among such influences, the
mutual effects of bands can not be seen on the same monitor screen, so the graph of the
frequency characteristic of each band is switched and adjusted, and it is repeated. By carrying
out, it was made for it to become a desired characteristic as a whole. Therefore, in the
conventional example, adjustment and setting of the frequency characteristic are difficult. On the
other hand, in the present invention, since the frequency characteristics of the three bands can
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be monitored and adjusted on the same monitor screen, the overall characteristics can be set
extremely easily and in a short time. Can. Also, since the overall frequency characteristics
obtained by adding the frequency characteristics of the set channels are displayed on the
monitor screen on which the setting frequency characteristics are displayed, the set overall
frequency characteristics are monitored. While being able to move the manipulator, it becomes
easier to adjust the frequency characteristics of the entire acoustic system to the desired
characteristics.
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